/*
 * Copyright 2010 Kevin L'Huillier <klhuillier@gmail.com>
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package org.lhuillier.pwsafe.io.v3;


import org.lhuillier.pwsafe.io.StretchedKey;


/**
 * Prepares a decryption key for a V3 database by stretching the password.
 */
public interface V3KeyStretcher {
    /**
     * @param data raw bytes of the encrypted database
     * @param password
     * @return
     */
    StretchedKey stretchKey(byte[] data, String password);
    
    /**
     * Creates a new key from the password using the default number of
     * iterations and a random salt.
     */
    StretchedKey createKey(String password);

    /**
     * Creates a new key from the password using the given number of
     * iterations and a random salt.
     */
    StretchedKey createKey(String password, int iterations);
    
    /**
     * Creates a new key from the password using the same number of iterations 
     * as the existing key a random salt.
     */
    StretchedKey resalt(StretchedKey key, String password);
}
